Eng is being tried in absentia and will present his testimony to the court in writing, his Hungarian lawyer Peter Zamecsnik said Friday.
Prosecutors said they believe the current case is the first football corruption trial in which Eng, who was arrested last year in Singapore along with several others believed to be involved in match-fixing, is a defendant.
The other defendants in the trial include Hungarian players, coaches and referees.
Testifying at Friday's court session was Wilson Raj Perumal, also from Singapore and a former member of Eng's syndicate. He was arrested in Finland in 2011, served a year in prison after a match-fixing conviction and was later extradited to Hungary, where he now lives.
He has provided information about match-fixing activities in several countries and is a witness for the prosecution.
Perumal, speaking through an interpreter, was asked by the judge to explain the basics of the syndicate's operations but the attempt was mostly thwarted by confusion over betting terminology and the lack of a projector to show the court a diagram of match-fixing schemes.
One of the matches drawing attention from the judge on Friday was a Dec. 2010 under-20 friendly match between Argentina and Bolivia. Hungarian referee Kolos Lengyel, after disallowing an apparently valid Argentina goal in the 76th minute, gave Argentina a penalty kick over 12 minutes into injury time. The hosts converted the penalty, winning 1-0.
Lengyel is also a witness for the prosecution and is expected to testify next week.